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2x+y = 7 (kali 4)
3x-4y = 27
maka :
8x+4y = 28
3x-4y = 27 (jumlahkan)
11x = 55
x =
= 5
Substitusi x ke salah satu persamaan
3x-4y =27
3(5)-4y = 27
15 - 4y = 27
- 4y = 27-15
= 12
y =
= -3
Maka : x = 5 dan y = -3